Working the hump in Union Pacific’s Davidson Yard in Fort Worth, Texas, on October 16, 2011, is SD40N 1613 and a pair of RP20BDs, 2626 and 2613. “SD40N” is a new designation for some SD40-2s on the UP, and this one was built as UP 3372. The RP20BDs were constructed by RPI from old GE B23-7 and B30-7 engines, usually of those built for the Missouri Pacific.

This SD40 still serves UP proudly even though its two years away from its 50th birthday. Despite being built in 1977, this is only the second number that this unit has worn. That's probably an all-time record for UP, who is known for uselessly renumbering locomotives over and over again.